Improved appendage to blast-pipes op blast-fttrnaces



hindert Stam vJOI-IN L. IAGNEW,'OF NEGAUNEE,.M ICHIGANQ Leiters Patent No. 93,032, daad .my 27,1869.V

IMPROVED APPENDAG-E TO BLAST-PIPES OF BLAST-FURNACES.

The Schedule referred to in these Letters Patent and making part of the same.

To.all whom 'it may concern Be it known that I, JOHN L. AGNEW the Village of Negaunee, county of Marquette, and State of Michigan, have' invented a new and useful machine', being a shutter or fixture for opening and closing thelsnufnghole or aperture, through which a rod is inserted to clear the tuyere, which hole is usually in the elbowed blast-pipe, sometimes called the vgooseneck; immediately adjacent to the tuyere of smelting, blast, melting, or other furnaces. The-said shutter is also designed to afford the means of examining and viewing the interior of said tuyere or furnace; and I do declare that the following is a full, clear, and exact description of the construction and operation of the same, reference being had to the annexed drawings, making a part of this specication, in which- Figure 1 is aver-tical section, at right angles to axis of tuyeres, on dotted line :v-y of fig. 2.

Figure 2 is a horizontal section through axis of tuyere, or rather in plane of same.

Figure 3 is a vert-ical section through axis of tuyere, on line e-fw of iig. 2.

In this specification, as well as in the accompanying drawings,- the axis of the tuyere is supposed to be horizontal, and the axis of the shutter vertical.

A is a cylindrical piece of metal, (I have made it of cast-imm) having a ange for attaching it to the gooseneck or tuyere-pipe.

This casting is bored out to fit the plug B, which-l.

have also\made of cast-iron, as shown in drawings.

Through this casting A are the holes D, made in direction of axis of tuyere, which holes correspond with similar holes, F and E, in plug B, all to admit the insertion of the snuiiing-bar or sight, depending on position of plug B.

B is a cylindrical plug, turned to fit the casting A.

In top of this plug is the handle C for turning same around in opening and shutting the snorting-hole.

lThrough this plug B are bored two horizontal holes, F and E, best at right angles with each other, the one, F, being of sufficient size to admit the snuiiing-bar. The other, E, arranged to have an eye-glass, G, fastenedin place by the hollow nut H, as shown more 4fully in drawings, through which the interior-oftuyere and furnace can be viewedavithout the escape of air.

I is a set-pin, fast in the casting A, its top extending up into a circular slot, K, in plug B. The said slot is of such length that it admits of the plug Blieing moved only one-quarter turn, thus making the holes F and E in the plug B correspondwith the holes D in the casting A at will.

The use of this stopper is as follows:

'By turning the plugB until the hole F corresponds with the hole D, or is opposite to it,'then it is open .to admit the snuiiing-bar. By turning it one-quarter around, until the hole E corresponds or comes opposite to the hole`l), then the stopper is closed to the escape of air, and the glass G permits a view inside.

What I claim as my invention, and desire to secure by Letters Patent, is-

An ail-tight plug and cylinder, with substantially the arrangement and combination of holes and glass or glasses in same, as is above particularly set forth, and for the purpose herein described.

' JOHN L. AGNEW.

Witnesses T. B. B Rooxs, G. H. HOPKINS. 

